$ git clone -n https://src.fedoraproject.org/rpms/nautilus.git /var/lib/mock/f42-build-side-1-3582982-46886/root/chroot_tmpdir/scmroot/nautilus
Cloning into '/var/lib/mock/f42-build-side-1-3582982-46886/root/chroot_tmpdir/scmroot/nautilus'...
$ git fetch origin 25e32d138da52fc897cc3b66125f6708eff18b09:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nautilus
 * [new ref]         25e32d138da52fc897cc3b66125f6708eff18b09 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 25e32d1 Update to 48.3